import type { CustomFetchResponse, FileResponse } from '../types/http.js';
type AnyResponse = CustomFetchResponse | Response;
/**
 * Wraps either a native `Response` or a `CustomFetchResponse` into the SDK's
 * `FileResponse` shape (binary endpoints: `viewAttachment`, `downloadBackup`).
 *
 * `arrayBuffer()` is resolved lazily. A customFetch implementation that omits
 * `arrayBuffer()` is still valid for callers that only read `text()`/`json()`;
 * the descriptive error is thrown only if the caller actually requests binary
 * bytes. This avoids the lossy `text()` → `TextEncoder` round-trip that
 * corrupts non-UTF-8 bytes (every `0x80`-`0xFF` byte not part of a valid UTF-8
 * sequence is replaced with `U+FFFD`).
 */
export declare function wrapAsFileResponse(response: AnyResponse, context: 'viewAttachment' | 'downloadBackup'): FileResponse;
export {};